Fuel-control mechanism for internal-combustion engines



H. L. TYGARD AND G. M. HAMILTON.

FUEL CONTROL MECHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 8, 1920.

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H. L. TYGARD AND G. M. HAMILTON.

FUEL CONTROL MECHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 8, 1920.

Patented July 29 1920.

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wfwesses:

UNITED STATES PATENT OFFICE.

HARRY L. TYGARD, OF PITTSBURGH, AND GEORGE M. HAMILTON, OF OAKMONT,

- PENNSYLVANIA.

FUEL-CONTROL MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented July 20, 1920.

Application filed May 8, 1920. Serial No. 379,829.

To all whom it may concern:

Be it known that we, HARRY L. TYGARD and (inouon M. HAuIL'roN, citizens of the United States, residing at Pittsburgh and Oakmont, respectively, in the county of Allegheny and State of Pennsylvania, nave invented certain new and useful Improvements in Fuel-Control Mechanism for Internal- Combustion Engines, of which the following is a specification.

()ur invention is an improvement in internal combustion-engines, and particularly in the motors of this type as used on automobiles or similar self-propelled vehicles.

It has in view to provide means for cutting off the fuel supply to the explosion chamber or chambers of the engine at times when the car is running upon its own momentum, as in coasting, and for simultaneously reducing the vacuumof the cylinders, and increasing the compression.

Primarily, it has in view to effect a corresponding economy in the use of the explosive fuel at such times as the engine is operating by motion transmitted to it from the connected gearing.

Ordinarily, in such cases, the conduit between the fuel supply, as a carburete'r, and the-explosion chambers of the cylinder or cylinders is normally open, so that when the engine is itself being operated by the turning over of the crank shaft and corresponding actuation of the plungers, there is an undesired suction of the fuel and a wasting thereof through the. ordinary exhaust passages, whether the explosive mixture be ignited or not.

Our invention has in view to provide means for cutting off the communication between the fuel supply and the explosive chamber or chambers at such time as propelling power of the engine is not needed, and at the same time opening communication from the cylinder or cylinders to the atmosphere so as to insure an ample supply of air with resulting higher compression and lower vacuum in the cylinders. It contemplates the simultaneous closing of the fuel supply, and opening of the circulation to the atmosphere, and vice versa.

The present invention 1s simllar 1n purpose and operation to that disclosed in our prior application filed November 3, 1919, Serial No. 335,502. It has. for 1ts object to provide a construction in which a common chamber, open to the manlfold, is placed in communication with the carbureter or with the atmosphere alternately, by the placing of one or the other in communlcation by means of a single operating valve and actuating mechanism therefor, controlled by a separate controlling valve, and utilizing the suction of the manifold and engine to operate the first-named valve.

In the drawings which illustrate one preferred embodiment of the invention,

Figure 1 is a vertical sectional view through a valve mechanism interposed between the fuel supply and the manifold leading to the engine and adapted to establish fuel circulation or air circulation therewith.

Fig. 2 is a horizontal sectional view on the line II-II of Fig. 1.

Fig. 3 is a View similar to Fig. 1 showing the valve in closing position against atmosphere and open to the fuel supply.

Fig. 1 is a detail view of the controlling valve for the operating valve in elevation.

In the drawings C represents the upper portion of a carbureter or other fuel supply device of any well known construction. The manifold M, also of ordinary type, leads to the explosion chamber or chambers of one or more cylinders communicating therewith by the usual lateral ports. Between the carbureter and the manifold is inserted our improved controlling device which consists of a suitable casing 2 of any convenient form havlng direct connection with the carbureter C by an intervening conduit 3 having a valve seated opening 4:, leading into the interior chamber 6 of casing 2'.

At its opposite side is a valve seated opening 5 communicating with the atmosphere by ports 7 through the upper portion of casing 2. An opening and closing valve 8, providedwith seating faces on its opposite sides, is adapted to seat upon and close either opening 4 and 5, in which case the other opening provides for free passage of either fuel or air. Valve 8 is mounted on the lower end of a valve stem 9 which extends upwardly through the bearing 10 at the middle portion of casing 2 and also through the central bottom portion of a diaphragm chamber 11.

Said chamber is mounted above casing 2 upon any suitable supporting frame, as arms 12 with free circulation space for the atmosphere. Chamber 11 as shown is formed of two bowl shaped parts connected by their flanges and bolts 13 at the middle portion, with an intervening flexible diaphragm 14 of leather or other suitable material. Diaphragm '14 is connected between disks of valve stem9 by a terminal nut 16, whereby to clamp the diaphragm fixedly between them.

A light spring 17 is provided to elevate the valve and hold it normally raised to maintain the circulation from the carbureter.

In operating valve 8 we desire to utilize the suction of the engine through the manifold by exerting a partial vacuum at one side or the other of the diaphragm 14 and for such purpose a pipe 18 is connected with the manifold, and alsowith the casing 19 of a controlling "valve 20. Such valve is designed to put the manifold directly into communication -with the interior of diaphragm chamber 11, below the diaphragm as in Fig. 1, by branch pipe 21, or above the diaphragm as in Fig. 3, by branch 22, by a quarter turn of the ported valve member. 20 in casing 19. v J

As shown, such valve may be of theordinary three way cock or any other suitable form'of valve may be utilized, whereby to establish direct connection between the manifold and one side or the other ofthe diaphragm. The effect of such action is to create a partial vacuum atsueh side of the diaphragm whereby to lower the valve 8 to cut off the fuel supply and open the atmos-.

phere ports, as in Fig. 1, or to open the. fuel supply and close the atm'os here as in Fig. 3.

The movement of the'valve 20 ma be imparted by any suitable means as a lever 23 and connecting rod 24 having any convenient manipulating terminal within the reach of the operator, as will be readily understood. By this eonstruction'and arrange- I ment we are enabled to effect the desired objects before stated, by utilization of the suction of the engine through the manifold by mere adjustment of the valve 20, and the closing of the fuel supply and of the atmosphere supply as'well as .the complete opening to either is easily and quickly effected.

in a very efficient manner.

The construction and arrangement of the invention as to its particular design, proportions or other details may be variously changed or modified by the skilled mechanic in its application to any particular type or form ofv carbureter, manifold, or other conditions incident to the type of engine with which it is used. For instance the circulation control mechanism, instead of being separately connected with the carbureter may be made as an integral or incorporated member of. it andwill operate in the same way as above described, and we do not wish to be limited to the exact construction shown.

What we claim is: 1. In an internal combustion engine,

I means for cutting oil the fuel supply and for simultaneously opening the combustion chamber to the atmosphere consisting of 3.

casing having an apertured wall at opposite sides of .a middle circulation chamber, a stem extending therethrough, provided with a valve adapted to close one wall or the other, and'means subject to the suction of the engine for actuating said valve.

. 2. In an internal combustion engine,

means for cutting off the fuel supply and for simultaneously opening the combustion chamber to the atmosphere consisting of a casing in open communication with the engine and having a valve seated port con-- nected with the fuel supply and a valve seated port opening to the atmosphere, an

alternately acting valve adapted to closev either port provided with a diaphragm and, 'a chamber therefor, and means for connecting either side of the diaphragm chamber with the combustion chamber of the engine.

-3. In an internal combustion engine, means for cutting ofi the fuel supply and for simultaneously opening the combustion chamber to the atmosphere consisting of a casing in open communication with the engine and having a valve seated port connected with the fuel supply and a valve seated port opening to the atmosphere, an

-alternately acting valve adapted to close I either port provided with a dlaphragmand a chamber therefor, a conduit connected with the engine intake having branch communications with either side of the diaphragm' chamber, and an intervening controlling valve adapted to open one of said connections and to close the other.

4. In combination, a chambered casin in open communication with the manifold of an internal combustion engine and provided with a valve seated fuel inlet port and air inlet port respectively, a valve adapted to seal either port, a diaphragm chamber provided with a diaphragm operatively connected with said valve, and a conduit connected with the chambered casing provided with a-controlling valve and a branch conduit' leading to the diaphragm chamber at each side of the diaphragm.

In combination, a chambered casing in open communication witlrthe manifold of HARRY L. TYGARD. GEORGE M. HAMILTON.

we hereunto aflix 

